Analysis of Dentinal Stress Distribution of Maxillary Central Incisors Subjected to Various Post-and-core Applications

Abstract

SUMMARYThis study evaluated the stress distribution on an endodontically treated maxillary central incisor restored with different post-and-core systems by using a three-dimensional finite element analysis model. Seven three-dimensional finite element models were created. Each model contained cortical bone, cancelous bone, periodontal ligament, 3 mm apical root canal filling, post-andcore and all-ceramic crowns. Two different prefabricated zirconia ceramic post systems, a glass fiber-reinforced post system and a titanium post system were modeled. As a control, an all-ceramic crown on an endodontically treated maxillary central incisor without a post-and-core was modeled. Each model received a 45°oblique occlusal load at a constant intensity of 100 N. In each model, the ratio of Von Mises stress distribution was compared. The greatest stresses were observed in the coronal third of the roots on facial surfaces. The ratio of Von Mises stress distribution in dentin for the zirconia ceramic post According to FEA analysis, under a simulated occlusal load, the cervical area of endodontically treated and crowned maxillary central incisors was the most stress concentrated area. Zirconia ceramic posts create slightly less dentinal stress concentration than titanium and glass-fiber posts. 90Operative Dentistry stress concentrations in dentin created by two different zirconia ceramic post systems were nearly the same. The zirconia ceramic post systems created slightly less stress concentration in dentin than the glass fiber-reinforced and titanium posts.

Finite element analysis of maxillary central incisors restored with various post-and-core applications

“…Conversely, core with higher elastic modulus reduced the strain of the glass fiber post and decreased the mechanical properties mismatch, leading to lower stress arising. If the modulus of elasticity of the core material is similar to the post material, a more uniform stress distribution within the entire post-and-core restoration and within dentin is achieved, while the restoration' s resistance is increased against the high forces of mastication 27,28) . As with many in vitro studies, it is difficult to extrapolate the results of this study directly to a clinical situation 29) .…”

Influence of Post and Resin Cement on Stress Distribution of Maxillary Central Incisors Restored with Direct Resin Composite

“…17 A ZC post can offer superior strength when compared with a GF post. [17][18] However, it is commonly accepted that post systems with an elastic modulus similar to that of dentin and core have better biomechanical performance. 19 In addition, the functional loading of a crown with a cemented post and core creates stresses in the prosthesis and the root.…”

Farklı post ve kron materyalleri ile restore edilmiş endodontik tedavili maksiller santral kesici dişlerde stres dağılımı

“…When FE modeling is compared with laboratory testing, it offers several advantages. The variables can be changed easily, simulation can be performed without the need for human material and it offers maximum standardization (Toksavul et al 2006). On the other hand, FEM has several limitations.…”

“…In the zirconia ceramic post system, two different core materials, composite and zirconia enriched glassceramic are being used. The use of zirconia ceramic post with composite core simplifies the restorative procedure, because all steps can be completed chairside (Toksavul et al 2006). …”

“…Prefabricated posts are divided into two groups: metallic, such as titanium alloy posts, and nonmetallic, such as zirconia ceramic, glass fiber-reinforced composite and glass-ceramic posts (Toksavul et al 2006). …”